CN111024849A - Method and system for reducing external interference of surface acoustic wave gas chromatograph - Google Patents
Method and system for reducing external interference of surface acoustic wave gas chromatograph Download PDFInfo
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 61
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- 238000010926 purge Methods 0.000 claims abstract description 127
- 230000001105 regulatory effect Effects 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 313
- 239000012159 carrier gas Substances 0.000 claims description 23
- 238000013375 chromatographic separation Methods 0.000 claims description 6
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- 230000007613 environmental effect Effects 0.000 description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
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Abstract
The invention discloses a method and a system for reducing external interference of a surface acoustic wave gas chromatograph, on one hand, the method comprises the following steps: leading out gas storage from the gas storage module; the flow of the stored gas is adjusted through a purge gas flow adjusting valve; and taking the gas storage after the flow is regulated as purge gas to purge the surface acoustic wave gas chromatograph. In another aspect, the system includes: the device comprises a gas storage module, a purge gas flow regulating valve, a gas path control module, a sample injection module, a switching valve, a detection module and a separation module; the gas storage module, the gas circuit control module, the sample injection module, the switching valve, the detection module and the separation module form a first gas circuit for detecting a sample; the gas storage module and the purge gas flow regulating valve form a second gas path, and purge gas is formed by regulating the flow of the gas storage in the second gas path to purge the detection module. Based on the gas storage that can flow certainly, cancelled the design of purge gas system, reduced the maintenance cost of instrument, improved the instrument interference killing feature, expanded the application environment of instrument.
Description
Technical Field
The invention relates to the field of gas chromatographs, in particular to a method and a system for reducing external interference of a surface acoustic wave gas chromatograph.
Background
The surface acoustic wave gas chromatograph is a precise analysis and test instrument, and the qualitative and quantitative detection of a sample is quickly carried out by combining a gas chromatography GC technology with a surface acoustic wave SAW technology. The collected mixed gas is selectively separated by utilizing a capillary separation technology, and different components in the sample sequentially flow out of the separation column, so that the classification of the sample is realized. After a certain sample component reaches the surface acoustic wave detector, the sample component is condensed and adsorbed on the surface of the detector as frequency change is detected due to the lower temperature of the detector, so that the quantification of the sample component is realized. In the detection process, because a sample continuously enters the detector, the detector needs to be blown and swept, the sample attached to the surface and the periphery of the detector is removed, the stop vibration of the detector is avoided, and the detection process can be continuously carried out. The above process is shown in figure 1.
With the development of analytical instruments, higher requirements are put forward for rapid detection of the instruments, and instruments which can separate different components in a sample more quickly and accurately and perform quantification undoubtedly have stronger competitiveness. In the prior art, the surface acoustic wave detector is purged by pumping ambient air through a purge pump, so that more control links are realized, and the failure rate of an instrument is increased. Meanwhile, because the air has complex components and contains interfering substances such as water vapor, dust, volatile organic compounds and the like, in order to avoid interference on the detector, the air needs to be filtered by using a filter pipe, and a maintenance link is added. Once the filter pipe is not replaced in time or is installed incorrectly, external pollutants are introduced, and the purge gas can cause interference to a detection result while removing residual samples attached to the surface and the periphery of the surface acoustic wave detector, so that the cleaning frequency of the detector is increased, and the service life of the detector is also shortened.
Further, in a high-temperature and high-humidity environment, ambient air is used as purge gas and filtered by the filter pipe, and partial water vapor or other interference sources still remain to be effectively filtered and enter the detector through the filter pipe, so that great interference is caused to a detection result, even the detector stops vibrating, and the application environment of the surface acoustic wave gas chromatograph is limited.
Disclosure of Invention
The invention aims to solve the defects in the prior art.
In order to achieve the above object, in one aspect, the present invention discloses a method for reducing external interference of a surface acoustic wave gas chromatograph, comprising the following steps:
leading out gas storage from the gas storage module; the flow of the stored gas is adjusted through a purge gas flow adjusting valve; and taking the gas storage after the flow is regulated as purge gas to purge the surface acoustic wave gas chromatograph.
In one example, after the stored air led out from the air storage module is adjusted by the pressure reducing valve, the flow of the stored air (purge air) is adjusted by the purge air flow adjusting valve.
In a further example, the gas storage regulated by the pressure reducing valve is divided by the multi-way connector, and the divided gas storage at least comprises a first gas path and a second gas path; the gas storage in the first gas path is used as carrier gas of the surface acoustic wave gas chromatograph, and the gas storage in the second gas path is used as purge gas.
In another aspect, the present invention discloses a system for reducing external interference of surface acoustic wave gas chromatograph, comprising: the device comprises a gas storage module, a purge gas flow regulating valve, a gas path control module, a sample injection module, a switching valve, a detection module and a separation module; wherein the content of the first and second substances,
the gas storage module, the gas circuit control module, the sample injection module, the switching valve, the detection module and the separation module form a first gas circuit; the gas storage module stores high-pressure gas, and the gas path control module adjusts the flow of carrier gas in the first gas path; mixing the adjusted carrier gas with the sample gasified in the sample injection module in the switching valve; the mixed gas enters a separation module for chromatographic separation; then the detection is finished by a detection module;
the gas storage module and the purge gas flow regulating valve form a second gas path; and the flow of the gas storage in the second gas path is adjusted through the purging gas flow adjusting valve, and the adjusted gas storage is sent out from the gas outlet of the purging gas flow adjusting valve to form purging gas, so that the detection module is purged.
In one example, the detection module is a surface acoustic wave detector; the separation module is a chromatographic column.
In one example, the gas path control module comprises a gas path control circuit board and a flow control gas path, and the gas path control circuit board is used for adjusting the flow of the carrier gas in the flow control gas path.
In one example, the system further comprises: and the pressure reducing valve is connected with the gas storage module and is used for adjusting the pressure of the gas storage sent by the gas storage module.
In one example, the system further comprises: the multi-way joint is used for forming a plurality of gas paths in the surface acoustic wave gas chromatograph.
In one example, the system further comprises: a deflation joint; the air release joint is in a closed state when the surface acoustic wave gas chromatograph is used; the air release joint is used for releasing air stored in the air storage module when the surface acoustic wave gas chromatograph is out of service.
In one example, the application environment of the system includes a high temperature and high humidity environment, i.e., an environment with a temperature greater than 30 ℃ and a relative humidity greater than 65 RH.
The invention has the advantages that: the device is applied to the surface acoustic wave gas chromatograph, so that the external interference of the instrument, especially the interference of water vapor, is effectively reduced, the instrument can normally operate in a high-temperature high-humidity environment, the test precision is improved, and the application environment of the instrument is expanded. Meanwhile, the load of the detector is reduced, and the cleaning times are reduced, so that the service life of the detector is prolonged. Because the gas storage has certain pressure and can flow automatically, a purging pump is not needed any more, and meanwhile, a gas circuit control circuit matched with the purging pump is not needed any more, so that the reliability of the instrument is improved. Because the gas storage is cleaner, the filter tube is cancelled, the user does not need to regularly replace the filter tube, and the maintenance cost of the instrument is reduced. The external interference of the surface acoustic wave gas chromatograph is obviously reduced, particularly the water vapor interference in the detection environment is reduced, and the method is suitable for high-temperature and high-humidity environments. In addition, the invention only changes the source of the purge gas, does not influence the flow of other gas paths such as carrier gas and the like and the control mode, and has the characteristic of easy implementation.
Drawings
FIG. 1 is a schematic diagram of a surface acoustic wave gas chromatography detection process;
FIG. 2 is a flow chart of a method for reducing external interference of a SAW gas chromatograph in accordance with the present invention;
FIG. 3 is a block diagram of the relationship between internal modules of the system for reducing the external interference of the SAW gas chromatograph according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for reducing external interference of a SAW gas chromatograph according to an embodiment of the present invention;
FIG. 5 is a block diagram of a SAW gas chromatograph module with a purge system according to the prior art;
FIG. 6(A) is a test result of an air sample of a SAW gas chromatograph with a purging system according to a first comparative example;
fig. 6(B) shows the air sample test result of a system for reducing external interference of a saw gas chromatograph according to a first embodiment of the present invention;
FIG. 7(A) is a test result of a SAW gas chromatograph air sample with a purging system of a comparative example II;
fig. 7(B) shows the air sample test result of a system for reducing external interference of a surface acoustic wave gas chromatograph according to a second embodiment of the present invention;
FIG. 8(A) is a test result of a SAW gas chromatograph air sample with a purging system of a third comparative example;
fig. 8(B) shows the air sample test result of a system for reducing external interference of a saw gas chromatograph according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a flow chart of a method for reducing external interference of a surface acoustic wave gas chromatograph according to the present invention, as shown in fig. 2.
The method comprises the following steps:
step S210: leading out the gas storage from the gas storage module.
Step S220: the flow of the stored gas is adjusted by the purge gas flow adjusting valve.
In one example, the purge gas flow regulating valve is regulated to make the flow of the purge gas sent out from the air outlet of the purge gas flow regulating valve be 3-15 ml/min.
Step S230: and taking the gas storage after the flow is regulated as purge gas to purge the surface acoustic wave gas chromatograph.
Specifically, steps S211 to S212 are also included between step S210 and step S220.
Step S211: after the gas storage led out from the gas storage module is adjusted through the pressure reducing valve, the flow of the gas storage is adjusted through the purge gas flow adjusting valve.
In one example, the gas storage module stores gas by high pressure, and the pressure of the gas storage is reduced to below 1MPa by a pressure reducing valve.
Step S212: the gas storage adjusted by the pressure reducing valve is divided by the multi-way connector, and the divided gas storage at least comprises a first gas path and a second gas path; the gas storage in the first gas path is used as carrier gas of the surface acoustic wave gas chromatograph, and the gas storage in the second gas path is used as purge gas.
In order to implement the method for reducing external interference of the surface acoustic wave gas chromatograph, a relational block diagram of internal modules of a system for reducing external interference of the surface acoustic wave gas chromatograph is shown in fig. 3. The system comprises a gas storage module 1, a purge gas flow regulating valve 5, a gas path control module, a sample injection module 8, a switching valve 9, a detection module 10 and a separation module 11; wherein the content of the first and second substances,
the gas storage module 1, the gas circuit control module, the sample injection module 8, the switching valve 9, the detection module 10 and the separation module 11 form a first gas circuit. Specifically, the flow of carrier gas in the first gas path is adjusted through the gas path control module; the adjusted carrier gas is mixed with the sample gasified in the sample injection module 8 in the switching valve 9; the mixed gas enters a separation module 11 for chromatographic separation; and then reaches the detection module 10 to complete the detection.
The gas storage module 1 and the purge gas flow regulating valve 5 form a second gas path. Specifically, the flow of the gas storage in the second gas path is adjusted through the purge gas flow adjusting valve 5, and the adjusted gas storage is sent out from the gas outlet of the purge gas flow adjusting valve 5 to form purge gas, so that the detection module is purged.
The application environment of the system comprises a conventional atmospheric environment, such as the temperature of 10-30 ℃ and the relative humidity of 30-65 RH; also included are environments where there is a severe contamination disturbance, such as high temperature and high humidity environments, i.e. environments with a temperature above 30 ℃ and a relative humidity above 65 RH.
The gas storage module 1 is used for storing high-pressure gas; the purge gas flow regulating valve 5 is used for regulating the flow of purge gas on the second gas path; the gas path control module is used for adjusting the flow of carrier gas on the first gas path; the sample injection module 8 is used for carrying out high-temperature gasification on the sample; the switching valve 9 is used for mixing the carrier gas and the sample; the detection module 10 is used for detecting a sample, specifically a surface acoustic wave detector; the separation module 11 is used for performing chromatographic separation on a sample, in particular a chromatographic column. The gas path control module comprises a gas path control circuit board 6 and a flow control gas path 7, and the flow of the carrier gas in the flow control gas path 7 is adjusted through the gas path control circuit board 6.
In one embodiment, a system for reducing external interference of a SAW gas chromatograph is shown in FIG. 4. The device comprises a gas storage module 1, a pressure reducing valve 2, a multi-way joint 3, a gas discharging joint 4, a purge gas flow regulating valve 5, a gas path control circuit board 6, a flow control gas path 7, a sample introduction module 8, a switching valve 9, a detection module 10 and a separation module 11; the multi-way connector 3 is a four-way connector, the detection module 10 is a surface acoustic wave detector, and the separation module 11 is a chromatographic column.
Specifically, the gas storage module 1 is connected with the gas inlet of the pressure reducing valve 2. The air outlet of the pressure reducing valve 2 is connected with the first end of the multi-way joint 3. The second end of the multi-way joint 3 is connected with a deflation joint 4; the third end of the multi-way joint 3 is connected with the air inlet of the purge air flow regulating valve 5, purge air is sent out from the air outlet of the purge air flow regulating valve 5, and the detection module 10 performs purge; the fourth end of the multi-way joint 3 is connected with an air inlet of a flow control air path 7 to convey carrier gas, and the carrier gas is stabilized to be constant flow through the flow control air path 7. The flow control gas circuit 7 is connected with the gas circuit control circuit board 6, and the flow parameters of the carrier gas in the flow control gas circuit 7 are controlled through the gas circuit control circuit board 6. The air outlet of the flow control air passage 7 is connected with a first air inlet of a switching valve 9; the sample is gasified at high temperature through the sample injection module 8, the sample injection module 8 is connected with a second air inlet of the switching valve 9, the gasified sample is sent to the switching valve 9, and the gasified sample and the carrier gas are mixed in the switching valve 9. The gas outlet of the switching valve 9 is connected with the gas inlet of the separation module 11, and the carrier gas pushes the mixed gas to enter the separation module 11 for chromatographic separation. The gas outlet of the separation module 11 is connected with the detection module 10, and the separated sample enters the detection module 10 to complete the detection of each component of the sample.
Wherein, the pressure reducing valve 2 is adjusted to reduce the gas storage pressure of the gas outlet of the pressure reducing valve 2 which is sent to the first end of the multi-way connector 3 to below 1 MPa. Because the gas storage module 1 is filled with high-pressure gas, the pressure sent out by the gas storage module 1 needs to be adjusted through the pressure reducing valve 2; at the same time, the gas storage flow is stabilized.
The air release joint 4 is in a closed state when the surface acoustic wave gas chromatograph is used; and when the surface acoustic wave gas chromatograph is stopped, emptying the gas storage in the gas storage module 1.
And adjusting the purge gas flow regulating valve 5 to ensure that the flow of the purge gas sent out from the air outlet of the purge gas flow regulating valve 5 is 3-15 ml/min.
The following is illustrated by specific comparative experiments:
the module relationship of a traditional surface acoustic wave gas chromatograph and a purging system thereof is shown in fig. 5. The device comprises a gas storage module 1, a purge gas flow regulating valve 5, a gas path control circuit board 6', a flow control gas path 7, a sample injection module 8, a switching valve 9, a detection module 10, a separation module 11, a purge pump 12 and a filter pipe 13; the gas path control circuit board 6' is used for controlling a flow control gas path 7 in the surface acoustic wave gas chromatograph and is also used for controlling a purging system, the detection module 10 is a surface acoustic wave detector, and the separation module 11 is a chromatographic column. Wherein the content of the first and second substances,
the gas storage module 1, the gas circuit control circuit board 6', the flow control gas circuit 7, the sample injection module 8, the switching valve 9, the detection module 10 and the separation module 11 form a first gas circuit. Specifically, the flow of the carrier gas in the flow control gas circuit 7 is regulated through the gas circuit control circuit board 6'; the adjusted carrier gas is mixed with the sample gasified in the sample injection module 8 in the switching valve 9; the mixed gas enters a separation module 11 for chromatographic separation; and then reaches the detection module 10 to complete the detection.
And the purge gas flow regulating valve 5, the gas path control circuit board 6', the purge pump 12 and the filter pipe 13 form a second gas path. Specifically, the working parameters of the purging pump 12 are adjusted through the gas circuit control circuit board 6'; the purge pump 12 sucks air through an air inlet thereof, and sends the air into the filter pipe 13 through an air outlet thereof for filtering, and the filtered air forms purge air after the flow of the purge air is adjusted by the purge air flow adjusting valve 5, so as to purge the detection module 10.
Comparative example 1
A surface acoustic wave gas chromatograph and a purging system thereof are formed by adopting modules shown in figure 5, and comprise a gas storage module 1, a purging gas flow regulating valve 5, a gas path control circuit board 6', a flow control gas path 7, a sample injection module 8, a switching valve 9, a detection module 10, a separation module 11, a purging pump 12 and a filter pipe 13; wherein, the purge pump 12 is a T3CP-1HE-04 purge pump (power supply 4V), the filter pipe 13 is an MT120 filter pipe, and the purge gas flow regulating valve 5 is a ZBTV 1LF purge gas flow regulating valve. The flow rate of the purge gas was adjusted to 10ml/min by adjusting the purge gas flow control valve ZBTV 1 LF. The air in the chamber A was used as a sample, and the test results are shown in FIG. 6(A), and the interference maximum value of the sample blank was 5.22 kHz/s.
Example one
A system for reducing external interference of a surface acoustic wave gas chromatograph is formed by modules shown in figure 4 and comprises a gas storage module 1, a pressure reducing valve 2, a multi-way connector 3, a gas release connector 4, a purge gas flow regulating valve 5, a gas path control circuit board 6, a flow control gas path 7, a sample introduction module 8, a switching valve 9, a detection module 10 and a separation module 11; wherein the purge gas flow regulating valve 5 is a ZBNV1LF purge gas flow regulating valve. And on an air path formed by the gas storage module and the ZBTV 1LF purge gas flow regulating valve, the ZBTV 1LF purge gas flow regulating valve is regulated to ensure that the flow of the purge gas is 10ml/min, and the purge gas with the regulated flow is used for purging the surface acoustic wave detector. The air in the chamber A was used as a sample, and the test results are shown in FIG. 6(B), and the interference maximum value of the sample blank was 1.95 kHz/s.
Comparing the comparative example I with the embodiment I, the comparative example I adopts the purging system in the prior art to purge the detection process, and the air blank of the surface acoustic wave gas chromatograph exceeds 5 kHz/s; in the first embodiment, air storage is adopted as purge gas, the air blank of the surface acoustic wave gas chromatograph is about 2kHz/s, and the external interference of the instrument under the same condition is obviously reduced.
Comparative example No. two
A surface acoustic wave gas chromatograph and a purging system thereof are formed by adopting modules shown in figure 5, and comprise a gas storage module 1, a purging gas flow regulating valve 5, a gas path control circuit board 6', a flow control gas path 7, a sample injection module 8, a switching valve 9, a detection module 10, a separation module 11, a purging pump 12 and a filter pipe 13; wherein, the purging pump 12 is an NMP 830 purging pump (power supply 12V), the filter pipe 13 is an activated carbon filter pipe (pipe diameter 1/4 inches), and the purge gas flow regulating valve 5 is a B-SS1-A purge gas flow regulating valve. The flow of the purge gas is adjusted to 10ml/min by adjusting a purge gas flow adjusting valve of B-SS 1-A. The air in the B chamber was used as a sample, and the test results are shown in FIG. 7(A), and the interference maximum value of the sample blank was 5.22 kHz/s.
Example two
A system for reducing external interference of a surface acoustic wave gas chromatograph is formed by modules shown in figure 4 and comprises a gas storage module 1, a pressure reducing valve 2, a multi-way connector 3, a gas release connector 4, a purge gas flow regulating valve 5, a gas path control circuit board 6, a flow control gas path 7, a sample introduction module 8, a switching valve 9, a detection module 10 and a separation module 11; wherein the purge gas flow regulating valve 5 is a B-SS1-A purge gas flow regulating valve. And on a gas path formed by the gas storage module and the B-SS1-A purge gas flow regulating valve, regulating the B-SS1-A purge gas flow regulating valve to ensure that the purge gas flow is 10ml/min, and purging the surface acoustic wave detector by using the purge gas with the regulated flow. The air in the B chamber was used as a sample, and the test results are shown in FIG. 7(B), where the interference maximum of the sample blank was 1.73 kHz/s.
Comparing the comparative example II with the example II, the purging system in the prior art is adopted to purge the detection process in the comparative example II, and the air blank of the surface acoustic wave gas chromatograph exceeds 3 kHz/s; in the second embodiment, air storage is adopted as purge gas, the air blank of the surface acoustic wave gas chromatograph is less than 2kHz/s, and the external interference of the instrument under the same condition is obviously reduced.
Comparative example No. three
The same surface acoustic wave gas chromatograph and purging system thereof, and the same type of device as in comparative example one were used. The system was placed in an incubator with ambient temperature set at 40 ℃, relative humidity set at 98RH, running air blank. The test result is shown in fig. 8(a), and it can be seen that the system cannot be used normally due to the large environmental temperature and humidity, the serious water vapor interference, and the vibration of the detector.
EXAMPLE III
The same system for reducing the external interference of the surface acoustic wave gas chromatograph and the same type of devices as those in the first embodiment are adopted. The system was placed in an incubator with ambient temperature set at 40 ℃, relative humidity set at 98RH, running air blank. The test result is shown in fig. 8(B), the maximum interference value of the sample blank is 9.35kHz/s, and it can be seen that the system can still operate normally under the condition of large interference caused by the environmental temperature and humidity.
Comparing the third comparative example with the third embodiment, it can be seen that in the third comparative example, the purging system in the prior art is adopted to purge the detection process under the high-temperature and high-humidity environment, and the surface acoustic wave gas chromatograph cannot be normally used; in the same high-temperature and high-humidity environment, in the third embodiment, the stored gas is used as the purge gas, and the surface acoustic wave gas chromatograph normally operates, so that the surface acoustic wave gas chromatograph can be suitable for the high-temperature and high-humidity environment.
By comparing the results of comparative example one with example one and comparative example two with example two, it can be seen that the effect of the example of the present invention is significantly better than that of the comparative example, although the same purge force is provided. The reason is that the traditional purging system is complex and is composed of a purging pump, a filter pipe, a purging gas flow regulating valve and a corresponding control circuit, and external pollution is easily introduced. The embodiment of the invention has the blowing function, directly provides the blowing gas by clean gas storage, only needs the blowing gas flow regulating valve, and has simple structure, small external pollution, good environmental adaptability and high reliability.
On the other hand, by comparing the results of comparative example one with example one and comparative example three with example three, with the prior art system, it was not possible to operate normally under severe external contamination (i.e., high temperature and high humidity). The embodiment of the invention has a self-contained purging function, the gas storage is a pure gas which is manually set based on the fact that the gas storage directly provides the purging gas, the interference caused by the external environment can be effectively reduced under the environment with serious external pollution, the chromatograph can normally operate, the structure is simple, the external pollution is small, the environmental adaptability is good, and the reliability is high.
The invention discloses a method and a system for reducing external interference of a surface acoustic wave gas chromatograph. The device has the advantages of low cost, simple control and easy maintenance, is applied to the surface acoustic wave gas chromatograph, effectively reduces the external interference of the instrument, improves the test precision, expands the application environment of the instrument, and simultaneously reduces the cleaning times due to the reduction of the load of the detector, thereby prolonging the service life of the detector.
Because the gas storage has certain pressure and can flow automatically, a purging pump is not needed any more, and meanwhile, a gas circuit control circuit matched with the purging pump is not needed any more, so that the reliability of the instrument is improved. Because the gas storage is cleaner, the filter tube is cancelled, the user does not need to regularly replace the filter tube, and the maintenance cost of the instrument is reduced. The external interference (especially the water vapor interference) of the surface acoustic wave gas chromatograph is obviously reduced, and the method can be applied to high-temperature and high-humidity environments. In addition, the invention only changes the source of the purge gas, does not influence the flow of other gas paths such as carrier gas and the like and the control mode, and has the characteristic of easy implementation.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for reducing external interference of a surface acoustic wave gas chromatograph is characterized by comprising the following steps:
leading out gas storage from the gas storage module;
the flow of the stored gas is adjusted through a purge gas flow adjusting valve;
and taking the gas storage after the flow is regulated as purge gas to purge the surface acoustic wave gas chromatograph.
2. The system of claim 1, wherein the reservoir is regulated by a pressure reducing valve and the flow of the reservoir is regulated by the purge gas flow regulator.
3. The system of claim 2, wherein the stored gas regulated by the pressure reducing valve is split by a multi-way joint, and the split gas comprises at least a first gas path and a second gas path; and the gas storage in the first gas path is used as a carrier gas of the surface acoustic wave gas chromatograph, and the gas storage in the second gas path is used as a purge gas.
4. A system for reducing external interference of a surface acoustic wave gas chromatograph, comprising: the device comprises a gas storage module, a purge gas flow regulating valve, a gas path control module, a sample injection module, a switching valve, a detection module and a separation module; wherein the content of the first and second substances,
the gas storage module, the gas circuit control module, the sample injection module, the switching valve, the detection module and the separation module form a first gas circuit; the gas storage module stores high-pressure gas, and the gas path control module adjusts the flow of carrier gas in the first gas path; the adjusted carrier gas is mixed with the sample gasified in the sample feeding module in the switching valve; the mixed gas enters the separation module for chromatographic separation; then the detection is finished when the detection module is reached;
the gas storage module and the purge gas flow regulating valve form a second gas path; and the flow of the gas storage in the second gas path is adjusted by the purge gas flow adjusting valve, and the adjusted gas storage is sent out from the gas outlet of the purge gas flow adjusting valve to form purge gas, so that the detection module is purged.
5. The system of claim 4, wherein the detection module is a surface acoustic wave detector; the separation module is a chromatographic column.
6. The system of claim 4, wherein the gas path control module comprises a gas path control circuit board and a flow control gas path, and the flow of the carrier gas in the flow control gas path is adjusted by the gas path control circuit board.
7. The system of claim 4, further comprising: and the pressure reducing valve is connected with the gas storage module and is used for adjusting the pressure of the gas stored by the gas storage module.
8. The system of claim 4, further comprising: and the multi-way joint is used for forming a plurality of gas paths in the surface acoustic wave gas chromatograph.
9. The system of claim 4, further comprising: a deflation joint;
the air release joint is in a closed state when the surface acoustic wave gas chromatograph is used;
and the air release joint is used for releasing air stored in the air storage module when the surface acoustic wave gas chromatograph is out of service.
10. The system of claim 4, wherein the application environment comprises a high temperature and high humidity environment, the high temperature and high humidity environment is an environment with a temperature greater than 30 ℃ and a relative humidity greater than 65 RH.
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